package com.qf.day1;

import java.util.Scanner;

public class Work {
    public static void main(String[] args) {
       Scanner scanner = new Scanner(System.in);
        System.out.print("请输入两个数字: ");
        float num1 =  scanner.nextInt();
        float num2 = scanner.nextInt();
        System.out.println(num1*num2/2);

    }
}
